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Height Adjustment Question

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Old Apr 11, 2015 | 06:42 PM
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I feel dumb asking this because I had no issue getting the height perfect on my C6Z06 - must be doing something wrong or maybe gotten way too picky about my C7 Z51.

Anyway when I took delivery my new Z51 it was raised like a 4 wheel drive, very tall from the factory, wheel gap was amazingly high. After the first 500+ miles it did settle a bit, but there was still way too much wheel well for my taste, so used the proper procedure relieving the pressure on the composite spring and lowered each bolt 4 turns. I didn't want to go all the way down because I have a steep driveway. I drove 100 more miles to let it settle and measured to find the front not quite perfectly the same on both sides (the rear was not perfect either). I readjusted, then drove again and measured again - still off by .25" or so (passenger front was lower than driver front by .25" and driver rear higher by .25+/-. So I adjusted again and drove to settle them again. But I just can't seem to get them perfect. I wanted to drop it a bit and still leave the 1" rake front to rear.

I've measured on different surfaces too, trying to make sure it's flat. Each time I measure the fronts are off by .25 or a bit more as well as the rear. What the heck am I doing wrong - is there a proper "procedure"? Should I slam all four to the bottom then adjust up from there?

Too picky I guess - many of us vette guys are. It's not a huge deal, I'm just seeking consistent perfection of the height adjustment.

Just to confirm, I do realize which direction of the bolt turn is up and down. Anyway, probably way too much information, sorry. I just can't seem to get them perfect.

Thanks for any input.
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Old Apr 11, 2015 | 09:16 PM
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Originally Posted by mojovious
I feel dumb asking this because I had no issue getting the height perfect on my C6Z06 - must be doing something wrong or maybe gotten way too picky about my C7 Z51.

Anyway when I took delivery my new Z51 it was raised like a 4 wheel drive, very tall from the factory, wheel gap was amazingly high. After the first 500+ miles it did settle a bit, but there was still way too much wheel well for my taste, so used the proper procedure relieving the pressure on the composite spring and lowered each bolt 4 turns. I didn't want to go all the way down because I have a steep driveway. I drove 100 more miles to let it settle and measured to find the front not quite perfectly the same on both sides (the rear was not perfect either). I readjusted, then drove again and measured again - still off by .25" or so (passenger front was lower than driver front by .25" and driver rear higher by .25+/-. So I adjusted again and drove to settle them again. But I just can't seem to get them perfect. I wanted to drop it a bit and still leave the 1" rake front to rear.

I've measured on different surfaces too, trying to make sure it's flat. Each time I measure the fronts are off by .25 or a bit more as well as the rear. What the heck am I doing wrong - is there a proper "procedure"? Should I slam all four to the bottom then adjust up from there?

Too picky I guess - many of us vette guys are. It's not a huge deal, I'm just seeking consistent perfection of the height adjustment.

Just to confirm, I do realize which direction of the bolt turn is up and down. Anyway, probably way too much information, sorry. I just can't seem to get them perfect.

Thanks for any input.

I would take a look at the side you like, then tighten (or loosen) the adjuster all the way down, taking note of the exact number of turns
it took, adjust it back and then adjust the other side to the same setting.

On my car I wanted it all the way down since my driveway isn't that steep and the car is less than 1/16th difference from side to side when sitting on level ground.
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Old Apr 11, 2015 | 09:16 PM
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Originally Posted by mojovious
I feel dumb asking this because I had no issue getting the height perfect on my C6Z06 - must be doing something wrong or maybe gotten way too picky about my C7 Z51.

Anyway when I took delivery my new Z51 it was raised like a 4 wheel drive, very tall from the factory, wheel gap was amazingly high. After the first 500+ miles it did settle a bit, but there was still way too much wheel well for my taste, so used the proper procedure relieving the pressure on the composite spring and lowered each bolt 4 turns. I didn't want to go all the way down because I have a steep driveway. I drove 100 more miles to let it settle and measured to find the front not quite perfectly the same on both sides (the rear was not perfect either). I readjusted, then drove again and measured again - still off by .25" or so (passenger front was lower than driver front by .25" and driver rear higher by .25+/-. So I adjusted again and drove to settle them again. But I just can't seem to get them perfect. I wanted to drop it a bit and still leave the 1" rake front to rear.

I've measured on different surfaces too, trying to make sure it's flat. Each time I measure the fronts are off by .25 or a bit more as well as the rear. What the heck am I doing wrong - is there a proper "procedure"? Should I slam all four to the bottom then adjust up from there?

Too picky I guess - many of us vette guys are. It's not a huge deal, I'm just seeking consistent perfection of the height adjustment.

Just to confirm, I do realize which direction of the bolt turn is up and down. Anyway, probably way too much information, sorry. I just can't seem to get them perfect.

Thanks for any input.
You cannot "count the turns" to make it even. These cars do NOT all have the bolts at the same height from the factory and even if they did, the suspension takes a bit to settle so it would still be off. Where are you measuring your height from? Don't measure the gap between the wheel and the fender at the top. That's not correct measuring procedure. Measure from the ground to the bottom of the car just behind or in front of the wheel well. You want the same distance on both sides of the car. Use same procedure for the rears. Hope it helps.

Ant
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Old Apr 11, 2015 | 09:24 PM
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Try opposite adjustments to the caddy corner 1/2 turn then test drive with hard left + hard right before measuring. .25" is not bad but you can cut it in half and should settle for that.
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Old Apr 12, 2015 | 06:06 AM
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Thanks for the replies! I have been measuring the gap from the tire to the fender and the ground to the fender. I will now measure the bottom of the car as suggested - duh, that makes a lot of sense. Now I really feel stupid

Thanks!
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